//
// Created by zhou on 2021/11/30.
//
#include <vector>
#include <iostream>
#include <set>
using namespace std;
class Solution {
public:
    vector<vector<int >> ans{0};
    vector<vector<int>> combinationSum(vector<int>& candidates, int target) {
        int size=candidates.size();
        if(target<=0)return
        for(int i=0;i<size;i++){
            combinationSum(candidates,target-candidates[i]);
        }
    }
};